Ablation de ZnO par laser UV (193 nm) : nano-agrégats en phase gazeuse

Ozerov, Igor; Bulgakov, Alexander V.; Nelson, D. K.; Castell, R.; Sentís, M.; Marine, W.

doi:10.1051/jp4:20030591

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…At the observation point situated far from the focal plane, the fluence of the focused ArF laser beam was about 200 mJ/cm 2 . This fluence is fairly high to induce the evaporation of atomic species from the nano-aggregates and their fragmentation [15,16]. The corresponding luminescence spectra are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Production of gas phase zinc oxide nanoclusters by pulsed laser ablation

Ozerov

Bulgakov

Nelson

et al. 2005

Applied Surface Science

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We present experimental results on the photoluminescence (PL) of gas-suspended zinc oxide nanoclusters prepared during ablation of sintered ZnO targets by a pulsed ArF laser in the presence of oxygen ambient gas. The PL spectra in the UV spectral region correspond to the exciton recombination in the nanoclusters which are crystallized and cooled down to the temperature of the ambient gas in the ablation chamber. The time evolution of the spectra as well as their dependence on the ambient gas pressure are discussed.

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Section: Resultsmentioning

confidence: 99%

Production of gas phase zinc oxide nanoclusters by pulsed laser ablation

Ozerov

Bulgakov

Nelson

et al. 2005

Applied Surface Science

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“…ZnO clusters prepared by laser ablation have been deposited on substrates or collected in gas-suspended nanoaggregates, , where they typically coalesce to 10−20-nm size particles with a relatively broad size distribution. Still smaller nanoparticles (of the order of 1 nm) have been obtained by laser ablation in liquid media, e.g., deionized water and ethanol, as confirmed by microscopic techniques .…”

Section: Introductionmentioning

confidence: 99%

Structures of Zinc Oxide Nanoclusters: As Found by Revolutionary Algorithm Techniques

et al. 2008

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We report the stable and low energy metastable structures of zinc oxide clusters, (ZnO) n , n ) 1-32, found using an evolutionary algorithm with polarizable shell interatomic potentials. This study comprises the first systematic search for nanoparticulate structures for this compound above n ) 18 and includes a comparison with other recent studies. As a function of n, global minimum and low energy metastable clusters evolve from rings (up to ca. 0.8 nm in diameter) to perfect closed bubbles (up to ca. 1.2 nm in diameter in the range reported), which are the structures that only contain tetragonal and hexagonal faces and all ions have a coordination number of three. The transition between the two structural families is blurred, with key structures that are also (i) open bubbles, which contain octagonal or larger faces, and (ii) bubbles that have handles, or two-dimensional ring fragments attached. A new nomenclature to describe these structures is defined. We find a greater stability of tetrahedral and trigonal coordinations compared to tetragonal for ZnO clusters in the range considered. Of the predicted global minimum clusters, spheroid cages n ) 12, 16, and 28, with symmetry point groups T h , T d and T, and barrels, which are a common motif, exhibit a relatively high stability. Bulklike wurtzite, or multilayered clusters, as well as the simple cuboid and related rock salt configurations are not found to be thermodynamically stable in the size range considered.

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“…The cluster size distribution is narrow and can be described by a Gaussian function with a maximum at 10 nm and a half-width of 3 nm. 23 The films, prepared with the optimized substrate temperature and gas partial pressures, have an intense UV excitonic luminescence and a very weak, defect-related band. The film thickness varies along the surface of a substrate, and thus allows measurements of film parameters as a function of film thickness.…”

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confidence: 99%